Are there horse hooves in geletain?

my sister said they put horse hooves in geletain. and she's ben vegetarian for like 9 years. but she said that one day and i told my mom and mom said to find that out myself before i believe that. do they really put horse hooves or any bone in geletain?also what about gummy bears/worms? also please include the link to the website (if its a website)